Supporting display unit for an overhead



FIG. 1 is an enlarged perspective view of a supporting display unit for an overhead garage door showing my new design, with the broken line showing for illustrative purposes only and forming no part of the claimed design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view thereof, with the opposite side being a mirror image;

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a supporting display unit for an overhead garage door, as shown and described. 